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  1. Hooray for aromatic and other highly conjugated systems!

    Seriously, they enable so much awesome stuff in chemistry and photonics and sunblock.

  2. I love Florence science so much. For those wondering how this works white light is made up of every other wavelength of light combined when they all hit our eye at once our brains declares that combo as white. When “white” light hits an object the material absorbs some of the energy from certain wavelengths which changes the frequency of that light to a wavelength to small for our eyes to see. This light is called black body radiation and is found in the infrared part of the spectrum. This light can still be picked up by cameras designed to see in that spectrum but all our eyes see is black. Sometimes surfaces won’t absorb energy from certain wavelengths of light and so what is reflected back is the same color as the frequency that impacted it. So when a blade of grass is green it is because all the other frequencies of light have been changed due to the loss of energy to a frequency not visible to is humans but light in the green part of the spectrum is reflected back. Florescent colors are created by the same process only instead of visible light being dropped into the infrared spectrum it is ultraviolet light normally found at frequency higher than what we can be perceived being dropped into the visible spectrum. That is why florescent color seem unnaturally bright. They are actually reflecting more visible light than we can see entering them. It is also why under lights with low amounts of UV radiation they can appear one color but under an UV light they can flores a totally different color.

  3. Fun fact: this principle is used in those “QLED” or “Quantum LED” or “quantum dot” TVs you see for sale at the store.

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